Material Specification

Alumina

Alumina (Al2O3) is one of the most widely specified, general-purpose technical ceramics. All alumina are very hard and wear resistant, with high compressive strength even against extreme temperatures and corrosive environments. Aluminas are also excellent electrical insulators and are gas tight.

Mechanical Properties

Table 1. Mechanical properties of alumina.

Property	Value	Units
Density	3.88	gm/cc
Hardness	82	Rockwell 45N
Tensile Strength	54	Kpsi
Modulus of Elasticity	46	psi x 106
Flexural Strength	51	kpsi
Poisson’s Ratio	0.23	-
Compressive Strength	368	kpsi
Fracture Toughness	4.3	MPa m1/2

Electrical Properties

Table 2. Electrical properties of alumina.

Property	Value	Units
Dielectric Strength	210	Ac volts/mil
Dielectric Constant	9.7	(at 1MHz)
Volume Resistivity	>1014	ohm-cm2/cm

Thermal Properties

Table 3. Thermal properties of alumina.

Property	Value	Units
Coefficient of Thermal Expansion	7.2	X10-6/°C
Thermal Conductivity	30.3	W/m°K
Specific Heat	0.2	cal/g°C
Max Working Temp	1750	°C
Shock Resistance	200	°C diff

All properties are at room temperature unless otherwise noted.

Engineering data are representative, and are not intended as absolute nor warrantable. Manufacturer's Data shown is blended from multiple sources and therefore illustrates the marketplace.

• Steatite
• Alumina
• Titania
• Zirconia
• Cordierite